4 ms·
Is the issue here quadratic factorization is not obvious or that the sign is wrong? Note that x(x+3) = 18 and x(x-3) = 18 are valid models of the same problem.
by grandempire 2y ago
Is the issue here quadratic factorization is not obvious or that the sign is wrong?
Note that x(x+3) = 18 and x(x-3) = 18 are valid models of the same problem. One finds the longer side in terms of the shorter, or vice versa
- hansvm 2y agoLooks like proofreading (sign being wrong) to me.
- __rito__ 2y agoYes, it is absolutely that. I have corrected it, and it should be okay now.
- zombot 2y agoBoth variants (+3 & -3) have the same shape, and so do their derivatives, but they do land in different places on the X axis. Is that irrelevant?
- __rito__ 2y ago> "Note that x(x+3) = 18 and x(x-3) = 18 are valid models of the same problem. One finds the longer side in terms of the shorter, or vice versa" That is the reason I made the mistake initially. They both were correct in my mind. But that's no excuse for the mistake, and I made a correction.